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It is particularly embarrassing for Bristol police because Mr Adunbi is a founding member of an advisory group seeking to create better relations between the black community and the force.

The Independent Police Complaints Commission has been alerted and the officer who discharged the Taser suspended from carrying one.

Mr Adunbi, who revealed he was singled out in another case of mistaken identity a decade ago, said last night: "The first time round it could have been an accident - but a second time, that's a racist attack.

"To know that I'm one of the founder members of the independent advisory group, created some years ago to improve the relationship between the Afro-Caribbean community and the constabulary, and to be treated like this, it's difficult."

Mr Adunbi, who said he has suffered sleepless nights since the incident, was Tasered outside his home in the Easton area of the city as he stood with his dog, Hazel.

The video recorded by a neighbour shows police approach and ask his name. He replies: "I'm not telling you my name. I've done no wrong."